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Abstract:

A bandwidth configuration method includes: A terminal acquires that a
narrow bandwidth mode is used at a network side by a downlink
transmission signal and/or an uplink transmission signal; and the
terminal configures a receiving bandwidth and/or a transmitting
bandwidth, where the receiving bandwidth and/or the transmitting
bandwidth corresponds to the narrow bandwidth mode at the network side.
The terminal side can acquire whether the network side uses the narrow
bandwidth technology, and automatically adjust a bandwidth of a
corresponding channel at the terminal side when the network side uses the
narrow bandwidth technology, so that intra-system performance loss and
inter-system interference that are caused by different bandwidth modes
between the terminal side and the network side are avoided, thus
improving performance of a communication system.

Claims:

1. A bandwidth configuration method, comprising: acquiring, by a
terminal, that a narrow bandwidth mode is used at a network side by a
downlink transmission signal and/or an uplink transmission signal; and
configuring, by the terminal, a receiving bandwidth and/or a transmitting
bandwidth, wherein the receiving bandwidth and/or the transmitting
bandwidth corresponds to the narrow bandwidth mode at the network side.

2. The method according to claim 1, wherein the acquiring, by the
terminal, that the narrow bandwidth mode is used at the network side by
the downlink transmission signal and/or the uplink transmission signal
comprises: receiving, by the terminal, a narrow bandwidth parameter sent
by the network side, wherein the narrow bandwidth parameter comprises: a
passband bandwidth parameter of the narrow bandwidth mode used by the
downlink transmission signal at the network side and/or a transition band
suppression characteristic parameter of the narrow bandwidth mode used by
the downlink transmission signal at the network side, and/or a passband
bandwidth parameter of the narrow bandwidth mode used by the uplink
transmission signal at the network side and/or a transition band
suppression characteristic parameter of the narrow bandwidth mode used by
the uplink transmission signal at the network side; and the configuring,
by the terminal, the receiving bandwidth and/or the transmitting
bandwidth, wherein the receiving bandwidth and/or the transmitting
bandwidth corresponds to the narrow bandwidth mode at the network side
comprises: configuring, by the terminal and according to the narrow
bandwidth parameter, the receiving bandwidth and/or the transmitting
bandwidth, wherein the receiving bandwidth and/or the transmitting
bandwidth corresponds to the narrow bandwidth mode at the network side.

3. The method according to claim 2, wherein if the bandwidth mode of the
downlink transmission signal and/or the uplink transmission signal is
switched at the network side, the method further comprises: receiving, by
the terminal, a bandwidth parameter of the switched downlink transmission
signal at the network side and/or uplink transmission signal at the
network side, and configuring the receiving bandwidth and/or the
transmitting bandwidth according to the bandwidth parameter.

4. The method according to claim 1, wherein the acquiring, by the
terminal, that the narrow bandwidth mode is used at the network side by
the downlink transmission signal comprises: obtaining, by the terminal,
passband average power of the downlink transmission signal and transition
band average power of the downlink transmission signal in predetermined
time; and if a ratio between the passband average power of the downlink
transmission signal and the transition band average power of the downlink
transmission signal is smaller than a predetermined threshold, acquiring
that the narrow bandwidth mode is used at the network side by the
downlink transmission signal.

5. The method according to claim 4, wherein the configuring, by the
terminal, the receiving bandwidth corresponding to the narrow bandwidth
mode at the network side comprises: configuring, by the terminal, the
receiving bandwidth to be a predetermined value.

6. The method according to claim 4, wherein the configuring, by the
terminal, the receiving bandwidth corresponding to the narrow bandwidth
mode at the network side comprises: receiving, by the terminal, data by
using each pre-configured narrow bandwidth mode respectively, wherein the
each narrow bandwidth mode is corresponding to each of multiple narrow
bandwidth modes of the downlink transmission signal, wherein the multiple
narrow bandwidth modes of the downlink transmission signal are preset by
the network side; comparing receiving performance of the each narrow
bandwidth mode; and selecting a narrow bandwidth mode with the optimal
receiving performance, and configuring the receiving bandwidth according
to the selected narrow bandwidth mode.

7. A bandwidth configuration method, comprising: sending, by a
network-side device, a narrow bandwidth parameter corresponding to a
currently-used narrow bandwidth mode to a terminal, to notify the
terminal that a narrow bandwidth mode is used at a network side.

8. The method according to claim 7, wherein if a bandwidth mode of a
downlink transmission signal and/or an uplink transmission signal is
switched at the network side, the method further comprises: sending, by
the network-side device, a bandwidth parameter of the switched downlink
transmission signal and/or uplink transmission signal to the terminal.

9. A bandwidth configuration terminal, comprising: a message obtaining
module, configured to acquire that a narrow bandwidth mode is used at a
network side by a downlink transmission signal and/or an uplink
transmission signal; and a bandwidth configuring module, configured to
configure a receiving bandwidth and/or a transmitting bandwidth, wherein
the receiving bandwidth and/or the transmitting bandwidth corresponds to
the narrow bandwidth mode at the network side.

10. The terminal according to claim 9, wherein the message obtaining
module is specifically configured to receive a narrow bandwidth parameter
sent by the network side, wherein the narrow bandwidth parameter
comprises: a passband bandwidth parameter of the narrow bandwidth mode
used by the downlink transmission signal at the network side and/or a
transition band suppression characteristic parameter of the narrow
bandwidth mode used by the downlink transmission signal at the network
side, or a passband bandwidth parameter of the narrow bandwidth mode used
by the uplink transmission signal at the network side and/or a transition
band suppression characteristic parameter of the narrow bandwidth mode
used by the uplink transmission signal at the network side; and the
bandwidth configuring module is specifically configured to configure,
according to the narrow bandwidth parameter obtained by the message
obtaining module, the receiving bandwidth and/or the transmitting
bandwidth, wherein the receiving bandwidth and/or the transmitting
bandwidth corresponds to the narrow bandwidth mode at the network side.

11. The terminal according to claim 9, wherein the message obtaining
module is specifically configured to obtain passband average power of the
downlink transmission signal and transition band average power of the
downlink transmission signal in predetermined time; and if a ratio
between the passband average power of the downlink transmission signal
and the transition band average power of the downlink transmission signal
is smaller than a predetermined threshold, acquire that the narrow
bandwidth mode is used by the downlink transmission signal at the network
side.

12. The terminal according to claim 11, wherein the bandwidth configuring
module is specifically configured to configure the receiving bandwidth to
be a predetermined value.

13. The terminal according to claim 11, wherein the bandwidth configuring
module comprises: a detecting sub-module, configured to receive data by
using each pre-configured narrow bandwidth mode respectively, wherein the
each narrow bandwidth mode is corresponding to each of multiple narrow
bandwidth modes of the downlink transmission signal respectively, wherein
the multiple narrow bandwidth modes of the downlink transmission signal
are preset by the network side; and compare receiving performance of the
each bandwidth mode; and a configuring sub-module, configured to select a
bandwidth mode with the optimal receiving performance, and configure,
according to the selected bandwidth mode, the receiving bandwidth.

Description:

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese Patent Application No.
201010613490.4, filed on Dec. 17, 2010, which is hereby incorporated by
reference in its entirety.

FIELD OF THE INVENTION

[0002] The present invention relates to the field of mobile communications
technologies, and in particular, to a bandwidth configuration method,
device, and system.

[0004] Currently, it is allowed in many countries to deploy WCDMA at a
main frequency band 900 MHz of a GSM (Global System for Mobile
Communications, global system for mobile communications), to introduce
the WCDMA into a new region by using a few base station sites, so as to
bring a better coverage effect. Coordinative deployment is a specific
implementation mode of deploying the WCDMA and the GSM at a same
frequency band. The coordinative deployment means that the WCDMA and the
GSM share a same site, and are deployed by a same operator. A carrier
interval between the WCDMA and the GSM is compressed into be smaller than
2.8 MHz. Although the coordinative deployment saves spectrum resources,
because the carrier interval between the WCDMA and the GSM is small,
inter-system interference is large, which causes network communication
performance to deteriorate. To solve the problem, a narrow bandwidth
technology applied at a network side is proposed.

[0005] The narrow bandwidth technology aims at reducing a passband
bandwidth and/or increase a transition band suppression characteristic.
By using the narrow bandwidth technology at the network side, a bandwidth
occupied by a transmission signal is reduced, so that in the coordinative
deployment, the inter-system interference is reduced. By taking an
example that the narrow bandwidth technology is used by a communication
device supporting a WCDMA network, filtering waveforms of a filter of the
communication device are as shown in FIG. 1, where a waveform 1 is a
bandwidth waveform specified in an existing communication standard; a
waveform 2 is a bandwidth waveform in a first narrow bandwidth mode, and
in the first narrow bandwidth mode, the passband bandwidth is the same as
the passband bandwidth specified in the existing communication standard,
but the transition band suppression characteristic is increased; and a
waveform 3 is a bandwidth waveform in a second narrow bandwidth mode, and
in the second narrow bandwidth mode, the passband bandwidth is reduced,
and the transition band suppression characteristic is increased. In the
narrow bandwidth mode, the width of the passband bandwidth and a value of
a transition band suppression characteristic parameter may be
specifically set by an operator according to actual demands. As an
example instead of a limitation, as shown in FIG. 2, during the
coordinative deployment of the WCDMA and the GSM, if the communication
device of the WCDMA network uses the narrow bandwidth technology, a 4.2
MHz narrow bandwidth is supported in a 5 MHz WCDMA frequency band, and a
0.8 MHz bandwidth may be saved, which is used by a GSM network; a 3.8 MHz
narrow bandwidth is supported in the 5 MHz WCDMA frequency band, and a
1.2 MHz bandwidth may be saved, which is used by the GSM network.

[0006] In the process of implementing the present invention, the inventor
finds that the prior art at least has the following problems:

[0007] In the existing WCDMA communication standard, a terminal side does
not support the narrow bandwidth technology. When the network side
applies the narrow bandwidth technology, because the terminal side does
not support the narrow bandwidth technology, intra-system performance
loss is caused by mismatching between a receiving bandwidth and a
transmitting bandwidth, and interference between adjacent systems is
increased.

SUMMARY OF THE INVENTION

[0008] Embodiments of the present invention provide a bandwidth
configuration method, device, and system, so as to avoid intra-system
performance loss and an increase of inter-system interference due to the
fact that a terminal side does not support a narrow bandwidth technology.

[0009] The objectives of the present invention is achieved by the
following technical solutions:

[0010] A bandwidth configuration method includes:

[0011] acquiring, by a terminal, that a narrow bandwidth mode is used at a
network side by a downlink transmission signal and/or an uplink
transmission signal; and

[0012] configuring, by the terminal, a receiving bandwidth and/or a
transmitting bandwidth, where the receiving bandwidth and/or the
transmitting bandwidth corresponds to the narrow bandwidth mode at the
network side.

[0013] A bandwidth configuration method includes:

[0014] receiving, by a terminal, data by using each pre-configured
bandwidth mode respectively, where the each bandwidth mode is
corresponding to each of multiple bandwidth modes of a downlink
transmission signal respectively, where the multiple bandwidth modes of
the downlink transmission signal are preset by a network side;

[0015] comparing receiving performance of the each bandwidth mode; and

[0016] selecting a bandwidth mode with the optimal receiving performance,
and configuring a receiving bandwidth according to the selected bandwidth
mode.

[0017] A bandwidth configuration method includes:

[0018] sending, by a network-side device, a narrow bandwidth parameter
corresponding to a currently-used narrow bandwidth mode to a terminal, to
notify the terminal that a narrow bandwidth mode is used at a network
side.

[0019] A bandwidth configuration terminal includes:

[0020] a message obtaining module, configured to acquire that a narrow
bandwidth mode is used at a network side by a downlink transmission
signal and/or an uplink transmission signal; and

[0021] a bandwidth configuring module, configured to configure a receiving
bandwidth and/or a transmitting bandwidth, where the receiving bandwidth
and/or the transmitting bandwidth corresponds to the narrow bandwidth
mode at the network side.

[0022] A bandwidth configuration terminal includes:

[0023] a detecting module, configured to receive data by using each
pre-configured bandwidth mode respectively, where the each bandwidth mode
is corresponding to each of multiple bandwidth modes of a downlink
transmission signal respectively, where the multiple bandwidth modes of
the downlink transmission signal are preset by a network side; and
compare receiving performance of the each bandwidth mode; and

[0024] a bandwidth configuring module, configured to select a bandwidth
mode with the optimal receiving performance, and configure a receiving
bandwidth according to the selected bandwidth mode.

[0025] A bandwidth configuration system includes:

[0026] a network-side device, configured to send a narrow bandwidth
parameter corresponding to a currently-used narrow bandwidth mode to a
terminal, to notify the terminal that a narrow bandwidth mode is used at
a network side; and

[0027] a terminal, configured to receive the narrow bandwidth parameter
sent by the network-side device, and configure, according to the narrow
bandwidth parameter, a receiving bandwidth and/or a transmitting
bandwidth, where the receiving bandwidth and/or the transmitting
bandwidth corresponds to the narrow bandwidth mode at the network side,
where the narrow bandwidth parameter includes: a passband bandwidth
parameter of a narrow bandwidth mode used by a downlink transmission
signal at the network side and/or a transition band suppression
characteristic parameter of the narrow bandwidth mode used by the
downlink transmission signal at the network side, and/or a passband
bandwidth parameter of a narrow bandwidth mode used by an uplink
transmission signal at the network side and/or a transition band
suppression characteristic parameter of the narrow bandwidth mode used by
the uplink transmission signal at the network side.

[0028] It can be seen from the technical solutions provided by the
embodiments of the present invention that, in the embodiments of the
present invention, the terminal side can acquire whether the narrow
bandwidth technology is used at the network side, and automatically
adjust the corresponding receiving bandwidth and/or transmitting
bandwidth at the terminal side when the narrow bandwidth technology is
used at the network side, so that intra-system performance loss and
inter-system interference that are caused by different bandwidth modes
between the terminal side and the network side are avoided, thus
improving performance of a communication system.

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To illustrate the technical solutions according to the embodiments
of the present invention or in the prior art more clearly, accompanying
drawings for describing the embodiments or the prior art are introduced
briefly in the following. Apparently, the accompanying drawings in the
following description are only some embodiments of the present invention,
and persons of ordinary skill in the art may further obtain other
drawings from the accompanying drawings without creative efforts.

[0030] FIG. 1 is a schematic diagram of waveforms of a filter in the prior
art;

[0031]FIG. 2 is a schematic diagram of bandwidth allocation in
coordinative deployment in the prior art;

[0032]FIG. 3 is a flow chart of a method according to an embodiment of
the present invention;

[0033]FIG. 4 is a flow chart of another method according to an embodiment
of the present invention;

[0034] FIG. 5 is a flow chart of a method according to a first embodiment
of the present invention;

[0035] FIG. 6 is a flow chart of a method according to a second embodiment
of the present invention;

[0036]FIG. 7 is a flow chart of a method according to a third embodiment
of the present invention;

[0037]FIG. 8 is a flow chart of a method according to a fourth embodiment
of the present invention;

[0038]FIG. 9 is a schematic structural diagram of a terminal according to
an embodiment of the present invention; and

[0039]FIG. 10 is a schematic structural diagram of another terminal
according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The technical solutions according to the embodiments of the present
invention are clearly and fully described in the following with reference
to the accompanying drawings in the embodiments of the present invention.
Obviously, the embodiments to be described are only part of rather than
all of the embodiments of the present invention. All other embodiments
obtained by persons of ordinary skill in the art based on the embodiments
of the present invention without creative efforts shall fall within the
protection scope of the present invention.

[0041] An existing communication device that applies a narrow bandwidth
technology is a network-side device. That is, the narrow bandwidth
technology is used at the network side. However, communication is still
performed according to a receiving bandwidth and a transmitting bandwidth
that are specified in an existing communication standard at a terminal
side. When the network side applies the narrow bandwidth, because the
terminal side and the network side have different downlink bandwidths
and/or uplink bandwidths, intra-system performance loss is caused by
mismatching between the receiving bandwidth and the transmitting
bandwidth, and interference between adjacent systems is increased. By
taking an example that a UMTS network supports the narrow bandwidth
technology as shown in FIG. 2, in the case that the network side supports
a 4.2 MHz narrow bandwidth, for a 16 QAM (a QAM modulation mode including
16 types of symbols; QAM, Quadrature Amplitude Modulation, quadrature
amplitude modulation) modulated HSDPA (High Speed Downlink Packet Access,
high speed downlink packet access), the throughput drops by 10%; while
for a 64 QAM modulated HADPA+, the throughput drops by 45%. To solve the
problem, an embodiment of the present invention provides a bandwidth
configuration method, and a processing procedure of the bandwidth
configuration method is as shown in FIG. 3, where a specific
implementation mode is as follows:

[0042] S301: A terminal acquires that a narrow bandwidth mode is used at a
network side by a downlink transmission signal and/or an uplink
transmission signal.

[0043] The narrow bandwidth mode used by the network side is as described
above.

[0044] S302: The terminal configures a receiving bandwidth and/or a
transmitting bandwidth, where the receiving bandwidth and/or the
transmitting bandwidth corresponds to the narrow bandwidth mode at the
network side.

[0045] If the narrow bandwidth mode is used by the downlink transmission
signal at the network side, the terminal configures the receiving
bandwidth; if the narrow bandwidth mode is used by the uplink
transmission signal at the network side, the terminal configures the
transmitting bandwidth; and if the downlink transmission signal at the
network side and the uplink transmission signal at the network side both
use the narrow bandwidth mode, the terminal respectively performs
corresponding configuration on the receiving bandwidth and the
transmitting bandwidth. The configuring the receiving bandwidth refers
to: configuring a downlink passband bandwidth and/or a transition band
suppression characteristic; and the configuring the transmitting
bandwidth refers to: configuring an uplink passband bandwidth and/or a
transition band suppression characteristic.

[0046] In the embodiment of the present invention, the terminal side can
acquire whether the narrow bandwidth technology is used at the network
side, and automatically adjust the corresponding receiving bandwidth
and/or transmitting bandwidth at the terminal side when the narrow
bandwidth technology is used at the network side, so that intra-system
performance loss and inter-system interference that are caused by
different bandwidth modes between the terminal side and the network side
are avoided, thus improving performance of a communication system.

[0047] As an example instead of a limitation, the method provided in the
embodiment of the present invention may be applied in network
coordinative deployment between WCDMA and a GSM, and may also be applied
in network coordinative deployment between WCDMA and TD-SCDMA, WCDMA and
LTE, and WCDMA and WIMAX; and may also employ the narrow bandwidth
technology to compress the bandwidth of the WCDMA, so that an interval
between two WCDMA frequency points is smaller than 5 MHz.

[0048] In the method provided by the embodiment of the present invention,
the terminal may specifically acquire that the network side uses the
narrow bandwidth mode by receiving a narrow bandwidth parameter sent by
the network side, where the narrow bandwidth parameter includes: a
passband bandwidth parameter of the narrow bandwidth mode used by the
downlink transmission signal at the network side and/or a transition band
suppression characteristic parameter of the narrow bandwidth mode used by
the downlink transmission signal at the network side, and/or a passband
bandwidth parameter of the narrow bandwidth mode used by the uplink
transmission signal at the network side and/or a transition band
suppression characteristic parameter of the narrow bandwidth mode used by
the uplink transmission signal at the network side. The implementation
mode of the foregoing S302 may be: according to the narrow bandwidth
parameter, configuring, by the terminal, a receiving bandwidth and/or a
transmitting bandwidth, where the receiving bandwidth and/or the
transmitting bandwidth corresponds to the narrow bandwidth mode at the
network side. The specific implementation mode may be: according to the
received passband bandwidth parameter of the narrow bandwidth mode used
by the downlink transmission signal and/or transition band suppression
characteristic parameter of the narrow bandwidth mode used by the
downlink transmission signal, configuring a passband bandwidth parameter
of a filter of a receiver and/or a transition band suppression
characteristic of the filter of the receiver, so that the receiving
bandwidth of the terminal is the same as the bandwidth of the downlink
transmission signal at the network side; and according to the received
passband bandwidth parameter of the narrow bandwidth mode used by the
uplink transmission signal and/or transition band suppression
characteristic parameter of the narrow bandwidth mode used by the uplink
transmission signal, configuring a passband bandwidth parameter of a
filter in a transmitter and/or a transition band suppression
characteristic of the filter in the transmitter, so that the transmitting
bandwidth of the terminal is the same as the bandwidth of the uplink
transmission signal at the network side.

[0049] Correspondingly, an embodiment of the present invention further
provides a method for configuring a bandwidth of a terminal with the
assistance of a network-side device. The method includes: sending, by the
network-side device, a narrow bandwidth parameter corresponding to a
currently-used narrow bandwidth mode to the terminal. The specific
implementation mode may be: sending, by the network-side device, through
a downlink channel, a narrow bandwidth parameter of a downlink
transmission signal and/or a narrow bandwidth parameter of an uplink
transmission signal currently configured at a network side to the
terminal. The narrow bandwidth parameter of the downlink transmission
signal and/or the narrow bandwidth parameter of the uplink transmission
signal is sent as a separate message, or may be carried in an existing
communication message sent by the network-side device. Further, the
message carrying the foregoing narrow bandwidth parameter also carries
bandwidth configuration identification information. The terminal
identifies, according to the bandwidth configuration identification
information, that the bandwidth parameter of the downlink transmission
signal at the network side and/or the bandwidth parameter of the uplink
transmission signal at the network side is received, and further performs
bandwidth configuration according to the bandwidth parameter. As an
example instead of a limitation, the bandwidth configuration
identification information may be used to identify that the corresponding
message carries the bandwidth parameter, and the terminal acquires, after
obtaining and parsing the corresponding bandwidth parameter, whether the
narrow bandwidth mode is used at the network side; and the bandwidth
configuration identification information may also be used to identify the
specific bandwidth mode corresponding to the corresponding message, and
the terminal directly acquires, according to the bandwidth configuration
identification information, whether the narrow bandwidth mode is used at
the network side.

[0050] In the method provided by the embodiment of the present invention,
the terminal may also acquire that the narrow bandwidth mode is used by
the downlink transmission signal at the network side in the following
manner: The terminal obtains passband average power of the downlink
transmission signal and transition band average power of the downlink
transmission signal in predetermined time; and if a ratio between the
passband average power of the downlink transmission signal and the
transition band average power of the downlink transmission signal is
smaller than a predetermined threshold, acquires that the narrow
bandwidth mode is used by the downlink transmission signal at the network
side. Correspondingly, the implementation mode that the terminal
configures the receiving bandwidth corresponding to the narrow bandwidth
mode at the network side may be: configuring, by the terminal, the
receiving bandwidth to be a predetermined value. The foregoing
predetermined time, the predetermined threshold, and the predetermined
value of the receiving bandwidth may be set by a user or a terminal
provider according to a network environment or through negotiation with
an operator. In addition, the implementation mode that the terminal
configures the receiving bandwidth corresponding to the narrow bandwidth
mode at the network side may also be: receiving, by the terminal, data by
using each pre-configured narrow bandwidth mode respectively, where the
each bandwidth mode is corresponding to each of multiple bandwidth modes
of the downlink transmission signal, where the multiple narrow bandwidth
modes of the downlink transmission signal are preset by the network side;
comparing receiving performance of the each narrow bandwidth mode; and
selecting a narrow bandwidth mode with the optimal receiving performance
(the narrow bandwidth mode at the terminal side corresponding to the
narrow bandwidth mode currently used by the network side has the optimal
receiving performance), and configuring, according to the selected narrow
bandwidth mode, the receiving bandwidth. As an example instead of a
limitation, the receiving performance may be evaluated by estimating a
downlink-channel receiving signal-to-noise ratio, or the receiving
performance may be evaluated by a downlink BLER (Block Error Ratio, block
error ratio) obtained through a CRC (Cyclic Redundancy Check, cyclic
redundancy check).

[0051] To solve the foregoing technical problems, an embodiment of the
present invention further provides a bandwidth configuration method, and
an implementation mode of the bandwidth configuration method is as shown
in FIG. 4, and includes:

[0052] S401: A terminal receives data by using each pre-configured
bandwidth mode respectively, where the each bandwidth mode is
corresponding to each of multiple bandwidth modes of a downlink
transmission signal respectively, where the multiple bandwidth modes of
the downlink transmission signal is preset by a network side.

[0053] S402: Compare receiving performance of the each bandwidth mode.

[0054] S403: Select a bandwidth mode with the optimal receiving
performance, and configure, according to the selected bandwidth mode, a
receiving bandwidth.

[0055] In the foregoing implementation mode, a terminal user or a terminal
provider pre-acquires multiple bandwidth modes configured by the network
side, where the multiple bandwidth modes include: bandwidth modes
configured according to an existing communication standard, and at least
one narrow bandwidth mode; each bandwidth mode has different downlink
passband bandwidths and/or transition band suppression characteristics.
Moreover, the terminal user or the terminal provider pre-configures, in
the terminal, bandwidth modes corresponding to the multiple bandwidth
modes at the network side.

[0056] Through this method, the terminal can obtain the optimal receiving
performance in real time. When the narrow bandwidth technology is used at
the network side, the terminal side can detect that the corresponding
narrow bandwidth mode has the optimal receiving performance, so as to
adjust to the corresponding narrow bandwidth mode. Therefore,
intra-system performance loss and inter-system interference that are
caused by different bandwidth modes at the terminal side and the network
side are avoided, thus improving performance of a communication system.

[0057] Specific implementation modes of the embodiments of the present
invention in actual applications are illustrated in detail below.

Embodiment 1

[0058] In a first embodiment of the present invention, coordinative
deployment is performed between WCDMA and a GSM, a base station at a
WCDMA network side uses a narrow bandwidth technology, and filtering
waveforms of a filter of the base station are as shown in FIG. 1. The
base station altogether configures three bandwidth modes, which
respectively are a bandwidth mode which is specified by an existing
communication standard and corresponds to a waveform 1, a first narrow
bandwidth mode corresponding to a waveform 2, and a second narrow
bandwidth mode corresponding to a waveform 3. A downlink transmission
signal of the base station currently uses the first narrow bandwidth mode
for data transmission. The processing procedure in the first embodiment
of the present invention is as shown in FIG. 5, and specifically includes
the following operations:

[0059] S501: The base station sends, on a downlink channel, a narrow
bandwidth parameter corresponding to the first narrow bandwidth mode
currently used by the base station (the narrow bandwidth parameter may
only include a transition band suppression characteristic parameter in
the first narrow bandwidth mode, and may also include a transition band
suppression characteristic parameter and a passband bandwidth), and also
carries bandwidth configuration identification information in a message
that sends the narrow bandwidth parameter at the same time. Specifically,
the narrow bandwidth parameter and the bandwidth configuration
identification information may be sent periodically on a broadcast
channel, and the narrow bandwidth parameter and the bandwidth
configuration information may also be sent through physical layer
signaling after the terminal is paged and found.

[0060] After the terminal starts, or when the terminal is handed over to a
cell frequency point of the base station, S502 is executed. The terminal
receives a downlink signal according to a receiving bandwidth specified
by the existing communication standard, if the narrow bandwidth parameter
and the bandwidth configuration identification information are received,
acquires that the narrow bandwidth mode is used by the downlink
transmission signal, and S503 is executed; and if the narrow bandwidth
parameter and the bandwidth configuration identification information are
not received, continues to receive the downlink signal according to the
receiving bandwidth specified by the existing communication standard.

[0061] S503: The terminal configures a filter of a receiver according to
the narrow bandwidth parameter (as an example instead of a limitation, it
may be a receiving shaping filter), and adjusts a transition band
suppression characteristic in a receiving bandwidth of the filter of the
receiver to be the same as that of the downlink transmission signal.

[0062] Through the foregoing processing procedure, the terminal supports a
downlink narrow bandwidth corresponding to the base station, thus
improving the receiving performance of the terminal.

[0063] If the narrow bandwidth mode is used by the uplink transmission
signal of the base station, the base station sends the narrow bandwidth
parameter corresponding to the narrow bandwidth mode used by the uplink
transmission signal to the terminal (reference may be made to the
foregoing processing procedure for the specific sending manner).
Reference may be made to the foregoing processing procedure for the
processing procedure that the terminal configures the corresponding
narrow bandwidth mode, which is not repeatedly described here. The
terminal, after configuring the transmitting bandwidth, supports the
uplink narrow bandwidth corresponding to the base station, thus improving
the uplink performance and reducing interference in a GSM network.

[0064] Further, in the foregoing processing procedure, an example is taken
for illustration, where S502 is performed after the terminal starts or
when the terminal is handed over to the cell frequency point of the base
station. It should be noted that, in actual applications, the terminal is
not limited to receiving the narrow bandwidth parameter and the bandwidth
configuration identification information in the foregoing situation. As
an example instead of a limitation, S502 may also be executed
periodically after the terminal is handed over to the cell frequency
point of the base station.

[0065] In the first embodiment of the present invention, if the bandwidth
mode is switched at a base station side, for example, switched to the
bandwidth mode specified by the existing communication standard, or
switched to the second narrow bandwidth mode, the bandwidth parameter
corresponding to the switched bandwidth mode is still sent to the
terminal through the downlink transmission signal, so that the terminal
is enabled to perform adaptive adjustment and configuration on the
receiving bandwidth or transmitting bandwidth.

Embodiment 2

[0066] In a second embodiment of the present invention, coordinative
deployment is performed between WCDMA and a GSM, a base station at a
WCDMA network side uses a narrow bandwidth technology, and filtering
waveforms of a filter of the base station are as shown in FIG. 1. The
base station altogether configures three bandwidth modes, respectively a
bandwidth mode which is specified by an existing communication standard
and corresponds to a waveform 1, a first narrow bandwidth mode
corresponding to a waveform 2, and a second narrow bandwidth mode
corresponding to a waveform 3. A downlink transmission signal of the base
station currently uses the first narrow bandwidth mode for data
transmission. The processing procedure in the second embodiment of the
present invention is as shown in FIG. 6, and specifically includes the
following operations:

[0067] After a terminal starts, or when the terminal is handed over to a
cell frequency point of the base station, S601 is executed. The terminal
receives a downlink signal according to a receiving bandwidth specified
by the existing communication standard, and S602 is executed after the
terminal searches and finds a cell covered by the base station.

[0068] S602: The terminal performs FFT (fast Fourier transform) on the
received data to a frequency domain, collects statistics about passband
average power of the downlink transmission signal and transition band
average power of the downlink transmission signal in predetermined time,
and S603 is executed.

[0069] S603: The terminal judges whether a ratio between the passband
average power of the downlink transmission signal and the transition band
average power of the downlink transmission signal is smaller than a
predetermined threshold, and if the ratio between the passband average
power of the downlink transmission signal and the transition band average
power of the downlink transmission signal is smaller than the
predetermined threshold, acquires that the narrow bandwidth mode is used
by the downlink transmission signal and S604 is executed; while if the
ratio between the passband average power of the downlink transmission
signal and the transition band average power of the downlink transmission
signal is not smaller than the predetermined threshold, continues to
receive the downlink signal according to the receiving bandwidth
specified in the existing communication standard.

[0070] S604: The terminal configures the receiving bandwidth of the filter
of the receiver to be a predetermined value.

[0071] When the terminal fails to obtain bandwidth configuration
information of the base station side through a downlink channel, or does
not obtain the bandwidth configuration information of the base station
side through the downlink channel, through the foregoing processing
procedure, after it is acquired that the narrow bandwidth mode is used by
the downlink transmission signal, the receiving bandwidth can be adjusted
in time, thus improving as much as possible receiving performance of the
terminal.

Embodiment 3

[0072] In a third embodiment of the present invention, coordinative
deployment is performed between WCDMA and a GSM, a base station at a
WCDMA network side uses a narrow bandwidth technology, and filtering
waveforms of a filter of the base station are as shown in FIG. 1. The
base station altogether configures three bandwidth modes, respectively a
bandwidth mode which is specified by an existing communication standard
and corresponds to a waveform 1, a first narrow bandwidth mode
corresponding to a waveform 2, and a second narrow bandwidth mode
corresponding to a waveform 3. A downlink transmission signal of the base
station currently uses the first narrow bandwidth mode for data
transmission. The processing procedure in the third embodiment of the
present invention is as shown in FIG. 7, and specifically includes the
following operations:

[0073] After a terminal starts, or when the terminal is handed over to a
cell frequency point of the base station, S701 is executed. The terminal
receives a downlink signal according to a receiving bandwidth specified
by the existing communication standard, and S702 is executed after the
terminal searches and finds a cell covered by the base station.

[0074] S702: The terminal performs FFT on the received data to a frequency
domain, collects statistics about passband average power of the downlink
transmission signal and transition band average power of the downlink
transmission signal in predetermined time, and S703 is executed.

[0075] S703: The terminal judges whether a ratio between the passband
average power of the downlink transmission signal and the transition band
average power of the downlink transmission signal is smaller than a
predetermined threshold, and if the ratio between the passband average
power of the downlink transmission signal and the transition band average
power of the downlink transmission signal is smaller than the
predetermined threshold, acquires that the narrow bandwidth mode is used
by the downlink transmission signal and S704 is executed; while if the
ratio between the passband average power of the downlink transmission
signal and the transition band average power of the downlink transmission
signal is not smaller than the predetermined threshold, continues to
receive the downlink signal according to the receiving bandwidth
specified in the existing communication standard.

[0076] S704: The terminal receives the downlink signal by using each
pre-configured narrow bandwidth mode respectively, and S705 is executed.

[0077] A terminal user or a terminal provider pre-acquires multiple narrow
bandwidth modes which are configured by a network side and as shown in
FIG. 1. Moreover, the terminal user or the terminal provider
pre-configures narrow bandwidth modes in the terminal, where the narrow
bandwidth modes in the terminal correspond to the multiple narrow
bandwidth modes at the network side.

[0078] S705: The terminal compares receiving performance of the each
narrow bandwidth mode, and S706 is executed.

[0079] The specific implementation mode of S705 may be, but not limited
to: obtaining and saving, by the terminal, the receiving performance of
the each narrow bandwidth mode, and comparing the saved receiving
performance of the each narrow bandwidth mode.

[0080] S706: The terminal selects a narrow bandwidth mode with the optimal
receiving performance. In the third embodiment of the present invention,
because the first narrow bandwidth mode is used by the downlink
transmission signal at the base station side, the narrow bandwidth mode
with the optimal receiving performance, where the narrow bandwidth mode
with the optimal receiving performance is selected by the terminal, is a
narrow bandwidth mode corresponding to the first narrow bandwidth mode.

[0081] S707: The terminal configures a receiving bandwidth of a filter of
a receiver according to the selected narrow bandwidth mode.

[0082] When the terminal fails to obtain bandwidth configuration
information of the base station side through a downlink channel, or does
not obtain the bandwidth configuration information of the base station
side through the downlink channel, through the foregoing processing
procedure, after it is acquired that the narrow bandwidth mode is used by
the downlink transmission signal, the receiving bandwidth can be adjusted
in time, thus improving as much as possible receiving performance of the
terminal.

Embodiment 4

[0083] In a fourth embodiment of the present invention, coordinative
deployment is performed between WCDMA and a GSM, a base station at a
WCDMA network side uses a narrow bandwidth technology, and filtering
waveforms of a filter of the base station are as shown in FIG. 1. The
base station altogether configures three bandwidth modes, respectively a
bandwidth mode which is specified by an existing communication standard
and corresponds to a waveform 1, a first narrow bandwidth mode
corresponding to a waveform 2, and a second narrow bandwidth mode
corresponding to a waveform 3. A downlink transmission signal of the base
station currently uses the first narrow bandwidth mode for data
transmission. The processing procedure in the fourth embodiment of the
present invention is as shown in FIG. 8, and specifically includes the
following operations:

[0084] After a terminal starts, or when the terminal is handed over to a
cell frequency point of the base station, S801 is executed. The terminal
receives a downlink signal by using each pre-configured bandwidth mode
respectively, and S802 is executed.

[0085] A terminal user or a terminal provider pre-acquires multiple
bandwidth modes which are configured by a network side and as shown in
FIG. 1. Moreover, the terminal user or the terminal provider
pre-configures bandwidth modes in the terminal, where the bandwidth modes
in the terminal correspond to the multiple bandwidth modes of the network
side. As an example instead of a limitation, the terminal user may
acquire a bandwidth configuration condition of the network side by
consulting a network operator through a network or a phone call.

[0086] S802: The terminal compares receiving performance of the each
bandwidth mode, and S803 is executed.

[0087] S803: The terminal selects a bandwidth mode with the optimal
receiving performance, and in the fourth embodiment of the present
invention, because the first narrow bandwidth mode is used by the
downlink transmission signal of the base station side, the bandwidth mode
with the optimal receiving performance, where the bandwidth mode with the
optimal receiving performance is selected by the terminal, is a bandwidth
mode corresponding to the first narrow bandwidth mode.

[0088] S804: The terminal configures a receiving bandwidth of a filter of
a receiver according to the selected bandwidth mode.

[0089] Through the method provided by the fourth embodiment of the present
invention, the terminal may obtain the optimal receiving performance in
real time. When the narrow bandwidth technology is used by the network
side, the terminal side may detect that a corresponding narrow bandwidth
mode has the optimal receiving performance, so as to adjust to the
corresponding narrow bandwidth mode. Therefore, intra-system performance
loss and inter-system interference that are caused by different bandwidth
modes between the terminal side and the network side are avoided, thus
improving performance of a communication system.

[0090] All or part of the steps of the foregoing method embodiments may be
implemented by a program instructing relevant hardware. The program may
be stored in a computer readable storage medium. When the program is
executed, the steps of the foregoing method embodiments are performed.
The storage medium may be any medium that may store program codes, such
as a ROM, a RAM, a magnetic disk, or an optical disk.

[0091] An embodiment of the present invention further provides a bandwidth
configuration terminal, and the structure of the bandwidth configuration
terminal is as shown in FIG. 9, where the specific implementation
structure includes:

[0092] a message obtaining module 901, configured to acquire that a narrow
bandwidth mode is used at a network side by a downlink transmission
signal and/or an uplink transmission signal, where the narrow bandwidth
mode used by the network side is as described above; and

[0093] a bandwidth configuring module 902, configured to configure a
receiving bandwidth and/or a transmitting bandwidth, where the receiving
bandwidth and/or the transmitting bandwidth corresponds to the narrow
bandwidth mode at the network side. If the narrow bandwidth mode is used
by the downlink transmission signal at the network side, the terminal
configures the receiving bandwidth; if the narrow bandwidth mode is used
by the uplink transmission signal at the network side, the terminal
configures the transmitting bandwidth; and if the downlink transmission
signal at the network side and the uplink transmission signal at the
network side both use the narrow bandwidth mode, the terminal
respectively performs corresponding configuration on the receiving
bandwidth and the transmitting bandwidth. The configuring the receiving
bandwidth refers to: configuring a downlink passband bandwidth and/or a
transition band suppression characteristic; and the configuring the
transmitting bandwidth refers to: configuring an uplink passband
bandwidth and/or a transition band suppression characteristic.

[0094] The terminal provided by the embodiment of the present invention
can acquire whether the network side uses the narrow bandwidth
technology, and automatically adjust a bandwidth of a corresponding
channel at the terminal side when the narrow bandwidth technology is used
by the network side, so that intra-system performance loss and
inter-system interference that are caused by different bandwidth modes
between the terminal side and the network side are avoided, thus
improving performance of the communication system.

[0095] In the terminal provided by the embodiment of the present
invention, the message obtaining module 901 is specifically configured to
receive a narrow bandwidth parameter sent by the network side, where the
narrow bandwidth parameter includes: a passband bandwidth parameter of
the narrow bandwidth mode used by the downlink transmission signal at the
network side and/or a transition band suppression characteristic
parameter of the narrow bandwidth mode used by the downlink transmission
signal at the network side, and/or a passband bandwidth parameter of the
narrow bandwidth mode used by the uplink transmission signal at the
network side and/or a transition band suppression characteristic
parameter of the narrow bandwidth mode used by the uplink transmission
signal at the network side. Correspondingly, the bandwidth configuring
module 902 is specifically configured to configure, according to the
narrow bandwidth parameter obtained by the message obtaining module, the
receiving bandwidth and/or the transmitting bandwidth, where the
receiving bandwidth and/or the transmitting bandwidth corresponds to the
narrow bandwidth mode at the network side. The specific implementation
mode may be: according to the received passband bandwidth parameter of
the narrow bandwidth mode used by the downlink transmission signal and/or
transition band suppression characteristic parameter of the narrow
bandwidth mode used by the downlink transmission signal, configuring a
passband bandwidth parameter of a receiving filter and/or a transition
band suppression characteristic of a receiving filter, so that the
receiving bandwidth is the same as the bandwidth of the downlink
transmission signal at the network side; and according to the received
passband bandwidth parameter of the narrow bandwidth mode used by the
uplink transmission signal and/or transition band suppression
characteristic parameter of the narrow bandwidth mode used by the uplink
transmission signal, configuring a passband bandwidth parameter of a
transmitting filter and/or a transition band suppression characteristic
of a transmitting filter, so that the transmitting bandwidth is the same
as the bandwidth of the uplink transmission signal at the network side.

[0096] In the terminal provided by the embodiment of the present
invention, another specific working mode of the message obtaining module
901 is that: obtaining passband average power of the downlink
transmission signal and transition band average power of the downlink
transmission signal in predetermined time; and if a ratio between the
passband average power of the downlink transmission signal and the
transition band average power of the downlink transmission signal is
smaller than a predetermined threshold, acquiring that the narrow
bandwidth mode is used by the downlink transmission signal at the network
side. Correspondingly, the bandwidth configuring module 902 is
specifically configured to configure the receiving bandwidth to be a
predetermined value. The predetermined time, the predetermined threshold,
and the predetermined value of the receiving bandwidth may be set by a
user or a terminal provider according to a network environment or through
negotiation with an operator. In another implementation mode, the
bandwidth configuring module 902 may specifically include: a detecting
sub-module 9021, configured to receive data by using each pre-configured
narrow bandwidth mode respectively, where the each narrow bandwidth mode
is corresponding to each of multiple narrow bandwidth modes of the
downlink transmission signal respectively, where the multiple narrow
bandwidth modes of the downlink transmission signal are preset by the
network side; compare receiving performance of the each bandwidth mode;
and select a bandwidth mode with the optimal receiving performance; a
configuring sub-module 9022, configured to configure the receiving
bandwidth according to the selected bandwidth mode.

[0097] An embodiment of the present invention further provides another
bandwidth configuration terminal, and the structure of the bandwidth
configuration terminal is as shown in FIG. 10, where the specific
implementation structure includes:

[0098] a detecting module 1001, configured to receive data by using each
pre-configured bandwidth mode respectively, where the each bandwidth mode
is corresponding to each of multiple bandwidth modes of a downlink
transmission signal respectively, where the multiple bandwidth modes of
the downlink transmission signal are preset by a network side; and
compare receiving performance of the each bandwidth mode; and

[0099] a bandwidth configuring module 1002, configured to select a
bandwidth mode with the optimal receiving performance, and configure,
according to the selected bandwidth mode, a receiving bandwidth.

[0100] A terminal user or a terminal provider pre-acquires multiple
bandwidth modes configured by the network side, where the multiple
bandwidth modes include: bandwidth modes configured according to an
existing communication standard, and at least one narrow bandwidth mode;
each bandwidth mode has different downlink passband bandwidths and/or
transition band suppression characteristics. Moreover, the terminal user
or the terminal provider pre-configures bandwidth modes in the terminal,
where the bandwidth modes in the terminal correspond to the multiple
bandwidth modes at the network side.

[0101] The terminal may obtain the optimal receiving performance in real
time. When the network side uses the narrow bandwidth technology, the
terminal side can detect that a corresponding narrow bandwidth mode has
the optimal receiving performance, so as to adjust to the corresponding
narrow bandwidth mode. Therefore, intra-system performance loss and
inter-system interference that are caused by different bandwidth modes
between the terminal side and the network side are avoided, thus
improving performance of the communication system.

[0102] An embodiment of the present invention further provides a bandwidth
configuration system, which includes a network-side device and a
terminal. The network-side device is configured to send a narrow
bandwidth parameter corresponding to a currently-used narrow bandwidth
mode to a terminal, to notify the terminal that a narrow bandwidth mode
is used at a network side. The terminal is configured to receive the
narrow bandwidth parameter sent by the network-side device, and
configure, according to the narrow bandwidth parameter, a receiving
bandwidth and/or a transmitting bandwidth, where the receiving bandwidth
and/or the transmitting bandwidth corresponds to the narrow bandwidth
mode at the network side. The narrow bandwidth parameter includes: a
passband bandwidth parameter of a narrow bandwidth mode used by a
downlink transmission signal at the network side and/or a transition band
suppression characteristic parameter of the narrow bandwidth mode used by
the downlink transmission signal at the network side, and/or a passband
bandwidth parameter of a narrow bandwidth mode used by an uplink
transmission signal at the network side and/or a transition band
suppression characteristic parameter of the narrow bandwidth mode used by
the uplink transmission signal at the network side.

[0103] The network side notifies the terminal side of the currently-used
bandwidth mode, so that the terminal side can acquire whether the network
side uses the narrow bandwidth technology, and automatically adjust the
corresponding receiving bandwidth and/or transmitting bandwidth at the
terminal side when the network side uses the narrow bandwidth technology.
Therefore, intra-system performance loss and inter-system interference
that are caused by different bandwidth modes between the terminal side
and the network side are avoided, thus improving performance of a
communication system.

[0104] The foregoing description is merely exemplary embodiments of the
present invention, and is not intended to limit the protection scope of
the present invention. Various modifications and replacements that can be
easily thought of by persons skilled in the art without departing from
the technical scope of the present invention should fall within the
protection scope of the present invention. Therefore, the protection
scope of the present invention should be subject to the appended claims.